Throttle-valve.



2 SHEETS-SHEET 1.

PATENTED JUNE 16, 1908.

G. W. MORRIS. THROTTLE VALVE,

APPLICATION FILED JUNE 17, 1907.

No. 890,682. PATENTED JUNE 1'6, 1908.

G. W. MORRIS. THROTTLB VALVE,

APIPLIOATION FILED JUNE 17, 1907.

2 SHEETS-SHEET 2l {@o @o @o 0@ PATENT OFFICE.

GEORGE W. MORRIS, OF RACINE, WISCONSIN.

THRo'rTLE-VALVE.

Specification of Letters Patent.

Application led .T une 17,

Patented June 16, 1908. 1907. Serial No. 379,435.

To all whom it may concern:

Be it known that I, GEORGE W. MORRIS, a subject of the King of GreatBritain, residing at Racine, county of Racine, State of Wisconsin, haveinvented certain new and useful Improvements in Throttle-Valves, ofwhich the following is a specification, reference being had to theaccompanying drawings.

In the operation of throttle valves, it is, of course, frequentlydesirable to move such valve graduallyT to regulate the quantity ofsteam'to the engine, but, as generally constructed, such valves can beso moved only with difhculty, owing to the frictional load ocasioned bythe pressure of steam on the va ve.

It is the obj ect of my invention to provide a valve of this characterthat can be moved very easily and as gradually as desired, and Iaccomplish this object by the means illustrated in the drawings andhereinafter fully described.

That which I believe to be new will be set forth in the claims.

In the accompanying drawings Figure l is a vertical section through thevalve and its casing and parts connected therewith, the section beingtaken in the direction of the travel of the valve. Fig. 2 is a verticalsection taken at line 2 2 of Fig. l. Fig. 3 is a view, partly in sectionand partly in plan, the section being taken at line 3 3 of Fig. 1. Eig.4 is a detail, being an enlarged perspective view of the main valve.Fig. 5 is a detail, being an enlarged perspective view of a supplementalvalve that is mounted on the main valve.

In the several figures of the drawings, in which corresponding parts areindicated by like reference characters, A indicates a casing to whichsteam is admitted through the end a, such steam passing u throughoppositely-located side-passages to the interior of the valve casing B,which valve casing is suitably secured by bolts c, or otherwise, to saidcasing A. Through the upper wall of the ca'sing A is formed a large portd through which the steam passes from the casing B to be conductedthrough the oppositely-located end openings e and f to the engine. Thisport d is controlled by a slide valve O mounted on a suitable seat andsliding between parallel guide-strips g preferably formed integral withthe casing A.

At opposite sides of the valve C and rising vertically from the upperface thereof are walls h h, in which, as best shown in Fig. 4, areformed in the upper edges wide notches i fi, respectively, said notchesbeing of the same size and located in the same relative ,t

positions in the two walls.

D indicates a rack-bar fitting in the notches i t" in the walls h h andfree to be moved longitudinally in said notches, the direction ofmovement of said rack-bar bein@` in the d irection of travel of the mainvalve C. On the lower edge or face of the rack-bar D are formed twoprojections j lc, respectively, each adapted to engage, when therack-bar D is reciprocated, with a supplemental valve seated upon theupper face of the mainvalve O. This supplemental valve is indicated by Eand is movably held between guide-strips m m on the face of said mainvalve C. This supplemental valve E lies over and closes a port n formedthrough the main valve C, and which, in the construction shown (see Fig.4), is in the form of a slot the ends of which are near the guide-stripsm m.

F indicates a guard-plate formed on or secured to the inner face of thevalve-casing B and rejecting over the rack-bar D, said guar( -platebeing provided to prevent accidental vertical displacement of therack-bar from its seat in the notches t' i.

G indicates a toothed sector secured against turning upon a shaft H. Asshown, that portion of the shaft H that lies within the upper end of thevalve-casing B is squared (see Fig. 2), and it is upon this squaredportion of the shaft H that the sector G is removably mounted. The shaftH is suitably journaled at the upper end of the valve-casing B, one endof said shaft having a bearing in a suitable hollow cap I which isscrewthreaded into an opening through one side wall of the valve-casingB.- At the opposite side of the valve-casing, the shaft H passes througha long stuiiing box J, the end of which screws into a similar sizedopening as that in which the cap I is screwed. By this construction, itis evident that the cap I and stuffing boX J can be reversed in positionso that the shaft H may project from either side of the device to adaptit for use in different positions. Upon the end of the shaft H thatprojects through the stufling boX J will be attacheda link or lever K,through which the shaft can be rocked to operate the valve mechanism.

In operation, with the parts as shown inv Figs. 1 and 2, and lsteamhaving been admitted through the passages described to the interior ofthe valve casing B, it is evident that, owing to the pressure of thesteam upon the comparatively great area of the main. valve C, it willtakey considerable force -to move said valve. The supplemental valve E,having avery much less area of surface exposed to the action of thesteam, can of course be moved much more readily, and by the mechanismdescribed such valve will be moved so as to open the port n before themain valve commences to move, and it is evident that when suchsupplemental valve is moved sufliciently to allow steam to pass throughthe port n such steam will exert an upward pressure against the mainvalve C, whereby the pressure upon the upper face of the main valve willbe counterbalanced, to a large extent, so that it can be moved graduallyand with ease. This primary moving of the supplemental valve isaccomplished by the rocking of the shaft II, which, of course, carrieswith it the toothed sector G that is secured to its squared portion,and, through the engagement of the teeth of such sector with the teethof the rack D, will cause such rack to be moved and will bring thedownward projection k against the edge of the su pleinental valve sothat said supple- :mentalD valve will move on the face of the main valveand uncover theport n. After this supplemental valve has uncovered theort n, the other downward projection,- namely that lettered j,-willstrike against the adjacent wall 71. on the main valve and move suchmain valve to the extent desired. so that steam can ass down through theport d, the main vzilve C moving easily at this time, owing, as beforeexplained, to the counterbalanoing, in part, at least, of the pressureof the steam in the valve casing B by the steam pressure from below thathad been previously admitted through the small ort n.

What I claim as my invention and desire .to secure by Letters Patent isz- 1. In a throttle-valve, the combination with a valve casing and amain slide-valve therein having a, port therethrough, of walls risingfrom said main slide-valve, a bar slidingly supported on said walls andhaving a limited movement thereon in the direction of travel of the saidvalve, a supplemental slide-valve on said main valve adapted to closesaid port in the main valve, means carried by said sliding bar adaptedto successively move said valves, and means for moving said sliding bar.

2. In a throttle-valve, the combination with a valve `casing and a mainslide-valve therein having a port therethrough, of walls rising fromsaid mainvslide-valve and having notches formed in their upper edges, abar slidingly mounted in said notches, a supplemental slide-valve onsaid main valve, means carried by said sliding bar ada ted tosuccessively move said valves, anc means for moving said sliding bar.

3. In a throttle-valve, the combination ywith a valve casing and aslide-valve therein having a port therethrough, of a supplemental valvecarried by said slide-valve and adapted to close said. port through themain valve, a sliding rack-bar having means for successively engagingthe said valves, a gear for engaging the teeth of the rack-bar, andvmeans for moving said gear.

4. In a throttle-valve, the combination with a valve casing and aslide-valve therein having a port therethrough, of a supplemental valvecarried by said slide-valve and adapted to close said port through themain valve, a sliding rack-bar having means for successively engagingthe said valves, a gear for engaging the teeth of the rack-bar, arock-shaft journaled in the said valve-casing, and means for rockingsaid shaft.

5. In a throttle-valve, the combination with a valve-casing and a mainslide-valve therein having a port therethrough, of walls rising fromsaid main slide-valve and having notches formed in their upper edges, arackbar slidingly mounted in said notches and provided on its lower edgewith two projections, a supplemental slide-valve on said main-valve,said main-valve and slide-valve being adapted to be engaged successivelyby said projections on said rack-bar, a gear for engaging the teeth ofthe rack-bar, and means for rotating said gear.

GEORGE W. MORRIS. Witnesses:

C. R. CARPENTER, HARVEY FORD.

